/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 26727
 * Date: 2025-08-17
 * Time: 15:36
 */
public class Test83 {
    public static int climbStairs(int n) {
        int[] dp = new int[n+1];
        dp[0] = 1;
        dp[1] = 1;
        for(int i = 2; i <= n; i++) {
            dp[i] = dp[i-1] + dp[i-2];
        }
        return dp[n];
    }

    public static void main(String[] args) {
        int ret = climbStairs(3);
        System.out.println(ret);
    }
}
